1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * MT STREAMS Virtual Console Redirection Device Driver 31 */ 32 33 #include <sys/types.h> 34 #include <sys/param.h> 35 #include <sys/errno.h> 36 #include <sys/kmem.h> 37 #include <sys/stat.h> 38 #include <sys/stream.h> 39 #include <sys/stropts.h> 40 #include <sys/strsun.h> 41 #include <sys/debug.h> 42 #include <sys/thread.h> 43 #include <sys/conf.h> 44 #include <sys/ddi.h> 45 #include <sys/sunddi.h> 46 #include <sys/tty.h> 47 #include <sys/sc_cvcio.h> 48 #include <sys/conf.h> 49 #include <sys/modctl.h> 50 51 52 /* 53 * Routine to to register/unregister our queue for console output and pass 54 * redirected data to the console. The cvc driver will do a putnext using 55 * our queue, so we will not see the redirected console data. 56 */ 57 extern int cvc_redir(mblk_t *); 58 extern int cvc_register(queue_t *); 59 extern int cvc_unregister(queue_t *); 60 61 static int cvcr_info(dev_info_t *, ddi_info_cmd_t, void *, void **); 62 static int cvcr_attach(dev_info_t *, ddi_attach_cmd_t); 63 static int cvcr_detach(dev_info_t *, ddi_detach_cmd_t); 64 static int cvcr_wput(queue_t *, mblk_t *); 65 static int cvcr_open(queue_t *, dev_t *, int, int, cred_t *); 66 static int cvcr_close(queue_t *, int, cred_t *); 67 static void cvcr_ioctl(queue_t *, mblk_t *); 68 69 static dev_info_t *cvcr_dip; 70 static int cvcr_suspend = 0; 71 72 static struct module_info minfo = { 73 1314, /* mi_idnum Bad luck number +1 ;-) */ 74 "cvcredir", /* mi_idname */ 75 0, /* mi_minpsz */ 76 INFPSZ, /* mi_maxpsz */ 77 2048, /* mi_hiwat */ 78 2048 /* mi_lowat */ 79 }; 80 81 static struct qinit cvcr_rinit = { 82 NULL, /* qi_putp */ 83 NULL, /* qi_srvp */ 84 cvcr_open, /* qi_qopen */ 85 cvcr_close, /* qi_qclose */ 86 NULL, /* qi_qadmin */ 87 &minfo, /* qi_minfo */ 88 NULL /* qi_mstat */ 89 }; 90 91 static struct qinit cvcr_winit = { 92 cvcr_wput, /* qi_putp */ 93 NULL, /* qi_srvp */ 94 cvcr_open, /* qi_qopen */ 95 cvcr_close, /* qi_qclose */ 96 NULL, /* qi_qadmin */ 97 &minfo, /* qi_minfo */ 98 NULL /* qi_mstat */ 99 }; 100 101 struct streamtab cvcrinfo = { 102 &cvcr_rinit, /* st_rdinit */ 103 &cvcr_winit, /* st_wrinit */ 104 NULL, /* st_muxrinit */ 105 NULL /* st_muxwrinit */ 106 }; 107 108 DDI_DEFINE_STREAM_OPS(cvcrops, nulldev, nulldev, cvcr_attach, 109 cvcr_detach, nodev, cvcr_info, (D_MTPERQ|D_MP), &cvcrinfo); 110 111 extern struct mod_ops mod_driverops; 112 113 static struct modldrv modldrv = { 114 &mod_driverops, /* Type of module. This one is a pseudo driver */ 115 "CVC redirect driver 'cvcredir' v%I%", 116 &cvcrops, /* driver ops */ 117 }; 118 119 static struct modlinkage modlinkage = { 120 MODREV_1, 121 &modldrv, 122 NULL 123 }; 124 125 126 int 127 _init() 128 { 129 return (mod_install(&modlinkage)); 130 } 131 132 int 133 _fini() 134 { 135 return (mod_remove(&modlinkage)); 136 } 137 138 int 139 _info(modinfop) 140 struct modinfo *modinfop; 141 { 142 return (mod_info(&modlinkage, modinfop)); 143 } 144 145 /*ARGSUSED*/ 146 static int 147 cvcr_attach(dev_info_t *devi, ddi_attach_cmd_t cmd) 148 { 149 if (cmd == DDI_RESUME) { 150 if (cvcr_suspend) { 151 cvcr_suspend = 0; 152 } 153 } else { 154 if (ddi_create_minor_node(devi, "cvcredir", S_IFCHR, 155 0, NULL, NULL) == DDI_FAILURE) { 156 ddi_remove_minor_node(devi, NULL); 157 return (-1); 158 } 159 cvcr_dip = devi; 160 } 161 return (DDI_SUCCESS); 162 } 163 164 static int 165 cvcr_detach(dev_info_t *dip, ddi_detach_cmd_t cmd) 166 { 167 if (cmd == DDI_SUSPEND) { 168 if (!cvcr_suspend) { 169 cvcr_suspend = 1; 170 } 171 } else { 172 if (cmd != DDI_DETACH) { 173 return (DDI_FAILURE); 174 } 175 ddi_remove_minor_node(dip, NULL); 176 } 177 return (DDI_SUCCESS); 178 } 179 180 /* ARGSUSED */ 181 static int 182 cvcr_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result) 183 { 184 register int error; 185 186 switch (infocmd) { 187 case DDI_INFO_DEVT2DEVINFO: 188 if (cvcr_dip == NULL) { 189 error = DDI_FAILURE; 190 } else { 191 *result = (void *)cvcr_dip; 192 error = DDI_SUCCESS; 193 } 194 break; 195 case DDI_INFO_DEVT2INSTANCE: 196 *result = (void *)0; 197 error = DDI_SUCCESS; 198 break; 199 default: 200 error = DDI_FAILURE; 201 } 202 return (error); 203 } 204 205 /* ARGSUSED */ 206 static int 207 cvcr_open(queue_t *q, dev_t *dev, int flag, int sflag, cred_t *cred) 208 { 209 WR(q)->q_ptr = q->q_ptr = (char *)2; 210 /* 211 * call into the cvc driver to register our queue. cvc will use 212 * our queue to send console output data upstream (our stream)to 213 * cvcd which has us open and is reading console data. 214 */ 215 if (cvc_register(RD(q)) == -1) { 216 cmn_err(CE_WARN, "cvcr_open: cvc_register failed for q = 0x%x", 217 q); 218 } 219 return (0); 220 } 221 222 /* ARGSUSED */ 223 static int 224 cvcr_close(queue_t *q, int flag, cred_t *cred) 225 { 226 /* 227 * call into the cvc driver to un-register our queue. cvc will 228 * no longer use our queue to send console output data upstream. 229 */ 230 cvc_unregister(RD(q)); 231 WR(q)->q_ptr = q->q_ptr = NULL; 232 return (0); 233 } 234 235 static int 236 cvcr_wput(queue_t *q, mblk_t *mp) 237 { 238 /* 239 * Handle network-transmitted control messages 240 */ 241 if (mp->b_datap->db_type == M_IOCTL) { 242 cvcr_ioctl(q, mp); 243 return (0); 244 } 245 /* 246 * Call into the cvc driver to put console input data on 247 * its upstream queue to be picked up by the console driver. 248 */ 249 if (!cvc_redir(mp)) 250 freemsg(mp); 251 return (0); 252 } 253 254 static void 255 cvcr_ioctl(queue_t *q, mblk_t *mp) 256 { 257 struct iocblk *iocp = (struct iocblk *)mp->b_rptr; 258 259 /* 260 * If this is a CVC_BREAK, drop to OBP/kmdb from here rather than 261 * passing the mblk on to cvc. If it is a disconnect, pass it on to 262 * cvc. Nothing else is currently supported, so NAK all others. 263 * Note that cvc_redir doesn't free the mblk passed in, so we can 264 * reuse it for ACKing. 265 */ 266 if (iocp->ioc_cmd == CVC_BREAK) { 267 abort_sequence_enter((char *)NULL); 268 miocack(q, mp, 0, 0); 269 } else if (iocp->ioc_cmd == CVC_DISCONNECT) { 270 (void) cvc_redir(mp); 271 miocack(q, mp, 0, 0); 272 } else { 273 miocnak(q, mp, 0, EINVAL); 274 } 275 } 276